Crazy as this sounds, the Japanese have uncovered a secret that would have Archimedes too surprised to even yell, "Eureka!" Enter the Age Prediction Machine, a device supposedly capable of guesstimating how old you are just by emitting a high-frequency sound similar to a mosquito's buzz.

There's actually a science behind this. As we age, our hearing deteriorates and loses its ability to tune in to high pitches. The Sonic Teenager Deterrent alarm uses just such a principle to solve loitering problems.

There's an equally nefarious purpose behind this 924 yen ($10) gadget. Just in case your blind date fibs about his or her age, this little buzzer is intended to put that to the test. That said, the Age Prediction Machine is only able to gauge ages in ranges dubbed young to teenagers; early 20s; barely 30s; and 40 years and above. Just make sure it doesn't get annoying enough to repel your date before you can get past your first meeting. Talk about a buzzkill.